JPH0790378A - Method for quenching steel pipe - Google Patents
Method for quenching steel pipeInfo
- Publication number
- JPH0790378A JPH0790378A JP23782093A JP23782093A JPH0790378A JP H0790378 A JPH0790378 A JP H0790378A JP 23782093 A JP23782093 A JP 23782093A JP 23782093 A JP23782093 A JP 23782093A JP H0790378 A JPH0790378 A JP H0790378A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- water
- quenching
- flow
- immersion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、浸漬方式の鋼管の焼入
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quenching method for steel pipes of the immersion type.
【０００２】[0002]
【従来の技術】鋼管を高張力、高靭性化するために焼入
れ、焼戻し処理を施すことが行われている。鋼管の焼入
方法はスプレー方式と内外面浸漬軸流焼入方式に大別さ
れる。冷却能力が大きく、装置の構造が単純であるとい
う観点から、内外面浸漬軸流焼入方式が優れている。内
外面浸漬軸流焼入方式とは加熱された鋼管を浸漬槽に投
入して浸漬し、鋼管の内外両面にその軸線方向に沿う冷
却水流（軸流）を与えて焼入を行う方式である。この方
式の焼入方法の問題点の一つとして、薄肉鋼管が浸漬槽
の水面上に浮上することに起因する焼入ムラの発生が挙
げられる。すなわち、薄肉鋼管においては、浸漬槽に浸
漬した後に槽内に設置された受台（又はローラ）上の所
定の位置に収まるまでの間に、浮力のために、鋼管の一
端が浸漬槽の水面上に浮上する現象が起こり、この浮上
した部分が冷却不足となり均一な熱処理が得られないと
いう問題が生じる。2. Description of the Related Art Quenching and tempering treatments are carried out in order to increase the tensile strength and toughness of steel pipes. Quenching methods for steel pipes are roughly classified into a spray method and an internal / external surface immersion axial flow quenching method. From the viewpoints of high cooling capacity and simple device structure, the inner and outer surface immersion axial flow quenching method is superior. The inner / outer surface immersion axial flow quenching method is a method in which a heated steel pipe is placed in a dipping tank and immersed, and quenching is performed by applying a cooling water flow (axial flow) along the axial direction to both the inner and outer surfaces of the steel pipe. . One of the problems of this type of quenching method is the occurrence of quenching unevenness due to the thin-walled steel pipe floating above the water surface of the immersion tank. That is, in a thin-walled steel pipe, one end of the steel pipe is immersed in the water surface of the dipping tank due to buoyancy until it is set in a predetermined position on the pedestal (or roller) installed in the dipping tank after being immersed in the dipping tank. There is a problem in that a phenomenon of floating above occurs, and the floating portion is insufficiently cooled, and uniform heat treatment cannot be obtained.
【０００３】図３を参照して説明する。図３（ａ）に示
すように、浸漬槽１内に冷却水供給管２から冷却水を供
給し、冷却水３内に、鋼管１０の軸方向に沿う冷却水流
４を形成しておき、焼入すべき鋼管１０を水平の姿勢で
この浸漬槽に矢印５に示すように投入する。図３（ｂ）
に示すように、冷却水流４は鋼管１０の内外面を冷却す
るが、鋼管内に気泡６を生じ、この気泡６が鋼管１０に
浮力を与えて浮上させる。図３（ｃ）に示すように、気
泡は、冷却水流４により、鋼管１０の一方の端部に寄せ
られ、特に薄肉鋼管では、鋼管１０の端部１１が浸漬槽
１の水面７の上に浮上する。従って、この端部１１は冷
却が十分でなく、焼入ムラが発生する。Description will be made with reference to FIG. As shown in FIG. 3 (a), cooling water is supplied from the cooling water supply pipe 2 into the immersion tank 1, and a cooling water flow 4 along the axial direction of the steel pipe 10 is formed in the cooling water 3 for firing. The steel pipe 10 to be put is put in this dipping tank in a horizontal posture as shown by an arrow 5. Figure 3 (b)
As shown in, the cooling water flow 4 cools the inner and outer surfaces of the steel pipe 10, but bubbles 6 are generated in the steel pipe, and the bubbles 6 give buoyancy to the steel pipe 10 to cause it to float. As shown in FIG. 3 (c), the bubbles are brought to one end of the steel pipe 10 by the cooling water flow 4, and particularly in a thin-walled steel pipe, the end 11 of the steel pipe 10 is above the water surface 7 of the dipping tank 1. Surface. Therefore, the end portion 11 is not sufficiently cooled and uneven quenching occurs.
【０００４】この浮上防止策として、例えば特公昭６０
−３９７３４号公報、特開昭６０−３７８５９号公報に
見られるように、浸漬前あるいは浸漬後に鋼管をクラン
プする方法や装置、また特公昭５８−５５２１７号公報
に見られるように浸漬後にカバーする方法や装置が有効
であると考えられるが、設備が複雑になり、費用が高く
なるという問題がある。また、浸漬後にクランプあるい
はカバーする方法ではタイミングが不適切であると、ク
ランプ又はカバーとの干渉により、鋼管に疵が発生する
という問題が生じる。As a measure for preventing this floating, for example, Japanese Patent Publication Sho 60
No. 39734, JP-A-60-37859, a method and apparatus for clamping a steel pipe before or after immersion, and a method for covering after immersion as shown in JP-B-58-55217. Although it is considered that the equipment is effective, there is a problem that the equipment becomes complicated and the cost becomes high. Further, if the timing of the method of clamping or covering after immersion is inappropriate, there is a problem that the steel pipe is flawed due to interference with the clamp or cover.
【０００５】また、この他に特公昭５５−３２７６６号
公報に開示されているように、浸漬槽への進入速度を制
御して低速で進入させる方法も開発されているが、設備
費用が高く、焼入ムラの発生が避けられないという問題
がある。In addition, as disclosed in Japanese Examined Patent Publication No. 55-32766, there has been developed a method of controlling the entry speed into the dipping tank to enter the dipping tank at a low speed, but the equipment cost is high. There is a problem that uneven quenching is inevitable.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記実情に鑑
み、内外面浸漬軸流焼入方式により鋼管を焼入れする際
に、薄肉鋼管の浮上による冷却不均一を防止する方法を
提供する。すなわち、内外面浸漬軸流焼入方式におい
て、薄肉鋼管の浮上を、鋼管に疵をつけることなく、ま
た焼入ムラを発生させることなく均一に焼入する方法を
提供することを目的とする。SUMMARY OF THE INVENTION In view of the above situation, the present invention provides a method for preventing uneven cooling due to floating of a thin-walled steel pipe when quenching the steel pipe by an inner / outer surface immersion axial flow quenching method. That is, it is an object of the present invention to provide a method for uniformly quenching the floatation of a thin-walled steel pipe in the inner and outer surface immersion axial flow quenching method without scratching the steel pipe and without causing uneven quenching.
【０００７】[0007]
【課題を解決するための手段】本発明は、鋼管を浸漬槽
中に水平姿勢で投入し管軸方向の水流により内外面浸漬
軸流焼入処理するに当り、浸漬槽に投入した鋼管の一端
が浮上するまでに浸漬槽に供給する水量を急速増加して
高水位進行流を形成し、鋼管浮上端よりその部分の浸漬
槽の水面を高くすることを特徴とする鋼管の焼入方法で
ある。この場合浸漬槽に鋼管を投入するに先立ち、浸漬
槽の水面高さを水噴射口の上縁高さから上方１５０ｍｍ
以内に保持保持しておくこととすれば、容易に上記高水
位進行流を形成することが可能となり、好適である。According to the present invention, one end of a steel pipe placed in a dipping tank is placed when the steel pipe is placed in a dipping tank in a horizontal posture and subjected to inner and outer surface immersion axial flow quenching treatment by a water flow in the axial direction of the pipe. Is a method of quenching a steel pipe characterized by rapidly increasing the amount of water supplied to the immersion tank before the surface rises to form a high-level progressive flow, and raising the water surface of the immersion tank in that part above the floating top of the steel pipe. . In this case, the water level of the immersion tank is 150 mm above the height of the upper edge of the water injection port before the steel pipe is put into the immersion tank.
It is preferable to hold it within the range, because the above-mentioned high water level advancing flow can be easily formed.
【０００８】[0008]
【作用】本発明は、鋼管の内外面浸漬軸流焼入方式によ
る焼入処理において、鋼管を浸漬槽内に浸漬した後、浸
漬槽に供給する水量を急速増加して高水位進行流を形成
し、鋼管浮上端の部分の水位が高くなるように、所定の
水量Ｑ2 （ｍ3 ／Ｈ）、圧力Ｐ2 （ＭＰａ）及び所定の
噴射開始時刻ＴF に軸流水流の水量を急速増加して噴射
する。この時、噴射開始時刻ＴF は下記条件を満たすよ
うにする。According to the present invention, in the quenching treatment of the inner and outer surfaces of the steel pipe by the axial flow quenching method, after the steel pipe is immersed in the immersion tank, the amount of water supplied to the immersion tank is rapidly increased to form a high water level progressive flow. Then, the water amount of the axial water flow is rapidly increased at a predetermined water amount Q 2 (m 3 / H), a pressure P 2 (MPa) and a predetermined injection start time T F so that the water level at the floating top of the steel pipe becomes high. And then jet. At this time, the injection start time T F should satisfy the following conditions.
【０００９】 ０＜ｆT1（Ｄ，ｔ，ｖ）−（ＴF −Ｔin）−ｆT2 ただし Ｔin：鋼管を浸漬槽に浸漬する時刻 ＴF ：水量Ｑ2 、圧力Ｐ2 で噴射開始する時刻 Ｄ ：鋼管外径 ｔ ：鋼管肉厚 ｖ ：鋼管が浸漬液に侵入する速度 Ｌ ：噴射口から鋼管の他端までの距離 ｆT1：鋼管が浸漬液に侵入してから浮き上がるまでの時
間（Ｄ，ｔ，ｖの関数） ｆT2：水量Ｑ2 、圧力Ｐ2 で噴射開始してから、距離Ｌ
位置の水位が高くなるまでの時間（Ｑ、Ｐ、Ｌ）の関
数） である。以上の条件により、浸漬槽に投入した鋼管の一
端が浮上するまでに、高水位進行流が鋼管浮上端より高
い水位となるようにする。0 <f T1 (D, t, v)-( TF- T in ) -f T2 However, T in : Time of immersing the steel pipe in the dipping tank TF : Injecting water with a water amount Q 2 and a pressure P 2 Time D: Outer diameter of steel pipe t: Thickness of steel pipe v: Speed at which steel pipe penetrates into immersion liquid L: Distance from injection port to the other end of steel pipe f T1 : Time from intrusion of steel pipe to immersion liquid (Function of D, t, v) f T2 : Distance L after the injection is started at the water amount Q 2 and the pressure P 2.
It is the time until the water level at the position rises (function of Q, P, L). Under the above conditions, the high water level advancing flow is set to have a higher water level than the floating upper end of the steel pipe before one end of the steel pipe put into the immersion tank floats.
【００１０】上記噴射開始時刻ＴF の式の内、鋼管が浸
漬液に侵入してから浮き上がるまでの時間ｆT1及び、水
量Ｑ2 、圧力Ｐ2 で噴射開始してから距離Ｌ位置の水位
が高くなるまでの時間ｆT2は、浸漬槽の形状、寸法、鋼
管の寸法、鋼管が浸漬液に侵入する速度、鋼管浸漬前後
の水量、圧力、及び噴射口から鋼管の他端までの距離等
により異なる。しかし、これらは浸漬槽及び鋼管につい
て、シミュレーション又は実験により定めることができ
る。従って、上記噴射開始時刻ＴF を定めることができ
る。In the above formula of the injection start time T F , the time f T1 from the time when the steel pipe enters the immersion liquid to the time when the steel pipe floats up, the water quantity Q 2 , and the water level at the distance L after the injection starts at the pressure P 2 The time to increase f T2 depends on the shape and size of the immersion tank, the size of the steel pipe, the speed at which the steel pipe enters the immersion liquid, the amount of water before and after the steel pipe is immersed, the pressure, and the distance from the injection port to the other end of the steel pipe. different. However, these can be determined for the immersion tank and the steel pipe by simulation or experiment. Therefore, the injection start time T F can be determined.
【００１１】図２は、上記噴射開始時刻を示すタイムチ
ャートである。鋼管を浸漬槽に浸漬する時刻Ｔinを始点
とし、鋼管が浸漬槽に浸漬してから浮き上がるまでの時
間ｆ T1を経過した時刻ＴE を終点とする。この終点時刻
ＴE に対して微少時間ΔＴだけ早い到達時刻ＴM に間に
合うような噴射開始時刻ＴF に水量Ｑ2 、圧力Ｐ2 で噴
射開始する。この噴射開始時刻ＴF は、水量Ｑ2 、圧力
Ｐ2 で噴射開始してから、距離Ｌ位置の水位が高くなる
までの時間ｆT2を知ることによって決定される。FIG. 2 is a timing chart showing the injection start time.
It is a chart. Time T at which the steel pipe is immersed in the immersion tankinStarting point
When the steel pipe is immersed in the dipping tank until it floats
Interval f T1Time TE Is the end point. This end time
TE Arrival time T which is earlier by a minute time ΔTM In between
The injection start time T that matchesF Water quantity Q2 , Pressure P2 Squirt in
Start shooting. This injection start time TF Is the water quantity Q2 ,pressure
P2 The water level at the distance L increases after the injection starts at
Time to fT2Is determined by knowing.
【００１２】時間ｆT1は、鋼管外径Ｄ、鋼管肉厚ｔ、鋼
管が浸漬液に侵入する速度ｖの関数であるから、これら
の条件が定まれば決定することができる。時間ｆT2は、
浸漬槽の寸法、水量Ｑ、圧力Ｐ、噴射口から鋼管の他端
までの距離Ｌの関数であるから、これらが決まれば、決
定することができる。従って、２つの時刻ＴinとＴFと
の関係は、条件に応じて一義的に定まる。実際には、こ
れらをシミュレーションによって定めてもよいし、実験
によって定めてもよい。これらの条件のデータを制御コ
ンピュータに記憶させておけば、容易に、正確に条件に
応じた水量制御、噴射開始時刻制御をすることができ
る。The time f T1 is a function of the outer diameter D of the steel pipe, the wall thickness t of the steel pipe, and the speed v at which the steel pipe penetrates into the immersion liquid, and can be determined if these conditions are determined. The time f T2 is
Since it is a function of the dimensions of the immersion tank, the amount of water Q, the pressure P, and the distance L from the injection port to the other end of the steel pipe, it can be determined if these are determined. Therefore, the relationship between the two times T in and T F is uniquely determined according to the conditions. In practice, these may be determined by simulation or experiment. By storing the data of these conditions in the control computer, it is possible to easily and accurately control the water amount and the injection start time according to the conditions.
【００１３】なお、鋼管を浸漬する前に、浸漬槽の水位
を冷却水供給管の噴射口の上端より上方１５０ｍｍ以下
の水位に調整しておく。鋼管を浸漬する前の浸漬槽の水
位が冷却水供給管の噴射口の上端より上方１５０ｍｍを
越えると、冷却水量を急増させた時に水面を所望の高さ
に高めることが困難になる。好ましくは鋼管を浸漬する
前の浸漬槽の水位は低いほどよく、浸漬槽の水位を零、
すなわち、冷却水供給管の噴射口の上端に一致する位置
に近付けておく方がよい。Before dipping the steel pipe, the water level in the dipping tank is adjusted to 150 mm or less above the upper end of the injection port of the cooling water supply pipe. If the water level in the dipping tank before dipping the steel pipe exceeds 150 mm above the upper end of the injection port of the cooling water supply pipe, it becomes difficult to raise the water surface to a desired height when the amount of cooling water is rapidly increased. Preferably, the lower the water level in the immersion tank before the steel pipe is immersed, the better, the water level in the immersion tank is zero,
That is, it is better to bring the cooling water supply pipe closer to a position corresponding to the upper end of the injection port.
【００１４】[0014]
【実施例】図１に示した本発明の実施例の工程図に従っ
て実施例を詳細に説明する。 （ａ）浸漬槽１内の冷却水３の水面７の水位を冷却水供
給管２の噴射口の上端より１５０ｍｍ以下に調整してお
き、浸漬槽１内に鋼管１０の軸方向の冷却水流４を形成
させておく。 （ｂ）焼入すべき鋼管１０を水平の姿勢でこの浸漬槽１
に投入する。冷却水流４は鋼管１０の内外面を冷却する
が、前述のように鋼管１０内に気泡６を生じ、この気泡
６が鋼管１０に浮力を与えて浮上させようとする。この
時、あらかじめ定めた噴射開始時刻で、浸漬槽に冷却水
供給管２の噴射口から供給する冷却水流２１を急増さ
せ、高い水位で矢印２３の方向に進行する高水位進行流
２２を発生させる。この時の水量Ｑ2 （ｍ3 ／Ｈ）、圧
力Ｐ2 （ＭＰａ）、噴射開始時刻ＴFは、条件に応じて
あらかじめコンピュータに記憶させてておく。 （ｃ）鋼管１０内に発生した気泡６は、鋼管１０の端部
１１を浸漬槽１の水面７の上に浮上させようとするが、
この時、矢印２３の方向に進行している高水位進行流２
２は、鋼管１０の端部が水面上に出ないように鋼管端部
の水位を上昇させる。従って、鋼管１０はその端部１１
を水面７上に浮上させることなく矢印２４で示す方向に
沈下する。 （ｄ）従って、図１（ｄ）に示すように、鋼管１０は水
中において冷却水流２１により均一に焼入され、焼入ム
ラが発生しない。Embodiments will be described in detail with reference to the process chart of the embodiment of the present invention shown in FIG. (A) The water level of the water surface 7 of the cooling water 3 in the immersion tank 1 is adjusted to 150 mm or less from the upper end of the injection port of the cooling water supply pipe 2, and the cooling water flow 4 in the axial direction of the steel pipe 10 is set in the immersion tank 1. To be formed. (B) The steel pipe 10 to be quenched is placed in a horizontal posture in the immersion tank 1
Throw in. The cooling water flow 4 cools the inner and outer surfaces of the steel pipe 10. However, as described above, the bubbles 6 are generated in the steel pipe 10, and the bubbles 6 give buoyancy to the steel pipe 10 to float. At this time, at a predetermined injection start time, the cooling water flow 21 supplied from the injection port of the cooling water supply pipe 2 to the immersion tank is rapidly increased to generate a high water level advancing flow 22 that advances in the direction of arrow 23 at a high water level. . The amount of water Q 2 (m 3 / H), the pressure P 2 (MPa), and the injection start time T F at this time are stored in the computer in advance according to the conditions. (C) The bubbles 6 generated in the steel pipe 10 try to float the end 11 of the steel pipe 10 above the water surface 7 of the immersion tank 1,
At this time, the high water level advancing flow 2 advancing in the direction of arrow 23
2 raises the water level of the steel pipe end so that the end of the steel pipe 10 does not come out above the water surface. Therefore, the steel pipe 10 has its end portion 11
Subside in the direction indicated by the arrow 24 without floating above the water surface 7. (D) Therefore, as shown in FIG. 1 (d), the steel pipe 10 is uniformly quenched in the water by the cooling water flow 21, and uneven quenching does not occur.
【００１５】表１に本発明の具体的例についてその諸元
を比較例と共に掲げた。外径４０６．４４ｍｍφ、肉厚
９．５２ｍｍの炭素鋼の鋼管を本発明方法で焼入した。
比較例は、同一の鋼管を、同一の浸漬槽で従来の方法で
焼入したものである。この例では図２における鋼管浸漬
時刻Ｔinと、高水位進行流２２を発生する噴射開始時刻
ＴF を一致させており、水流Ｑ1 ＝１５００ｍ3 ／Ｈを
急増して水流Ｑ2 ＝８０００ｍ3 ／Ｈとした。ΔＴ＝
０．２ｓｅｃとなっている。鋼管の端部及び中間部のテ
ンパ処理後の引張り強度ＴＳ及び降伏強度ＹＳの値を示
した。本発明では、明らかに一様な焼入が行われており
焼入ムラが解消した。Table 1 shows the data of specific examples of the present invention together with comparative examples. A steel tube of carbon steel having an outer diameter of 406.44 mmφ and a wall thickness of 9.52 mm was quenched by the method of the present invention.
In the comparative example, the same steel pipe is quenched in the same dipping tank by a conventional method. In this example, the steel pipe immersion time T in in FIG. 2 is made coincident with the injection start time T F for generating the high-level water flow 22, and the water flow Q 1 = 1500 m 3 / H is rapidly increased to increase the water flow Q 2 = 8000 m 3. / H. ΔT =
It is 0.2 sec. The values of the tensile strength TS and the yield strength YS after the tempering treatment of the end portion and the intermediate portion of the steel pipe are shown. In the present invention, clear uniform quenching was performed, and quenching unevenness was eliminated.
【００１６】[0016]
【表１】 [Table 1]
【００１７】[0017]
【発明の効果】本発明によれば、内外面浸漬軸流焼入方
式により鋼管を焼入れする際に、鋼管の浮上による冷却
不均一を防止することができ、鋼管に疵をつける恐れも
なく、焼入ムラの発生を確実に防止することができる。According to the present invention, when quenching a steel pipe by the inner and outer surface immersion axial flow quenching method, it is possible to prevent nonuniform cooling due to floating of the steel pipe, and there is no fear of scratching the steel pipe. It is possible to reliably prevent the occurrence of quenching unevenness.
【図１】実施例の工程図である。FIG. 1 is a process drawing of an example.
【図２】本発明を説明する噴射開始時刻チャートであ
る。FIG. 2 is an injection start time chart illustrating the present invention.
【図３】従来の工程図である。FIG. 3 is a conventional process diagram.
１ 浸漬槽 ２ 冷却水供給
管 ３ 冷却水 ４ 冷却水流 ５ 矢印 ６ 気泡 ７ 水面 ８ 排水管 １０ 鋼管 １１ 端部 ２１ 冷却水流 ２２ 高水位進行
流 ２３ 矢印 ２４ 矢印1 Immersion tank 2 Cooling water supply pipe 3 Cooling water 4 Cooling water flow 5 Arrows 6 Bubbles 7 Water surface 8 Drain pipe 10 Steel pipe 11 End 21 Cooling water flow 22 High water level advancing flow 23 Arrows 24 Arrows
Claims (2)
方向の水流により内外面浸漬軸流焼入処理するに当り、
浸漬槽に投入した鋼管の一端が浮上するまでに浸漬槽に
供給する水量を急速増加して高水位進行流を形成し、鋼
管浮上端よりその部分の浸漬槽の水面を高くすることを
特徴とする鋼管の焼入方法。1. When a steel pipe is placed in a dipping tank in a horizontal posture and subjected to an axial dipping axial flow quenching treatment by a water flow in the axial direction of the pipe,
It is characterized by rapidly increasing the amount of water supplied to the immersion tank until one end of the steel pipe put in the immersion tank rises to form a high-level progressive flow, and raising the water level of the immersion tank in that part from the floating top of the steel pipe. How to quench steel pipe.
槽の水面高さを水噴射口の上縁高さから上方１５０ｍｍ
以下に保持しておくことを特徴とする請求項１記載の鋼
管の焼入方法。2. The height of the water surface of the immersion tank is 150 mm above the height of the upper edge of the water injection port prior to introducing the steel pipe into the immersion tank.
The method for quenching a steel pipe according to claim 1, characterized in that it is held below.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23782093A JPH0790378A (en) | 1993-09-24 | 1993-09-24 | Method for quenching steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23782093A JPH0790378A (en) | 1993-09-24 | 1993-09-24 | Method for quenching steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0790378A true JPH0790378A (en) | 1995-04-04 |
Family
ID=17020889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23782093A Withdrawn JPH0790378A (en) | 1993-09-24 | 1993-09-24 | Method for quenching steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0790378A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012029268A1 (en) | 2010-09-02 | 2012-03-08 | 住友金属工業株式会社 | Steel pipe quenching method and steel pipe manufacturing method using same |
| CN102965480A (en) * | 2012-11-16 | 2013-03-13 | 上海交通大学 | Method and equipment for quenching and cooling thick-walled steel pipe |
| WO2014054287A1 (en) | 2012-10-04 | 2014-04-10 | Ｊｆｅスチール株式会社 | Method for manufacturing heavy wall steel pipe |
| GB2548416A (en) * | 2016-03-15 | 2017-09-20 | Arconic Inc | Improved methods for quenching metal tubes |
-
1993
- 1993-09-24 JP JP23782093A patent/JPH0790378A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012029268A1 (en) | 2010-09-02 | 2012-03-08 | 住友金属工業株式会社 | Steel pipe quenching method and steel pipe manufacturing method using same |
| US9267186B2 (en) | 2010-09-02 | 2016-02-23 | Nippon Steel & Sumitomo Metal Corporation | Method for quenching steel pipe and method for producing steel pipe using the same |
| WO2014054287A1 (en) | 2012-10-04 | 2014-04-10 | Ｊｆｅスチール株式会社 | Method for manufacturing heavy wall steel pipe |
| US20150247227A1 (en) * | 2012-10-04 | 2015-09-03 | Jfe Steel Corporation | Method for manufacturing heavy wall steel pipe |
| US9506132B2 (en) | 2012-10-04 | 2016-11-29 | Jfe Steel Corporation | Method for manufacturing heavy wall steel pipe |
| CN102965480A (en) * | 2012-11-16 | 2013-03-13 | 上海交通大学 | Method and equipment for quenching and cooling thick-walled steel pipe |
| GB2548416A (en) * | 2016-03-15 | 2017-09-20 | Arconic Inc | Improved methods for quenching metal tubes |
| GB2548416B (en) * | 2016-03-15 | 2019-06-12 | Arconic Inc | Improved methods for quenching metal tubes |
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